C-13/C-12 1,387 C-14 2,588 Calibration 586 Calving 553 Canada--Alberta 548 Canada--British Columbia 599 Canada--Northwest Territories 809 Canada--Quebec 553 Canada--Yukon Territory 723 Carbon 6,063 Carbon cycle 1,224 Carbon dioxide 3,377 Carbon isotopes 3,890 Carnivora 579 Cartography 638 Case studies 971 Cements 621 Cenozoic 18,774 Channels 595 Channels (waterways) 1,175 Chemical analysis 1,365 Chemical composition 4,004 Chemical ice prevention 1,025 Chemical properties 1,137 China--Qinghai-Xizang Plateau 524 Chlorophyll 787 Chlorophylls 880 Chordata 4,034 Circulation 1,394 Classification 790 Classifications 3,198 Clastic rocks 975 Clastic sediments 5,509 Clay 584 Clays 1,147 Clay soils 1,027 Climate 6,562 Climate change 12,231 Climate--Cycles and trends 1,183 Climate effects 2,673 Climate forcing 848 Climatic change 11,899 Climatic changes 3,752 Climatic factors 2,262 Climatology 2,895 Cloud cover 776 Cloud droplets 621 Cloud physics 2,349 Clouds 2,488 Cloud seeding 529 Clouds (meteorology) 2,148 Coastal environment 1,203 Coastal topographic features 1,166 Cold tolerance 717 Cold weather construction 3,549 COLD WEATHER CONSTRUCTION 666 Cold weather operation 1,615 Cold weather performance 1,710 Cold weather survival 840 Cold weather tests 758 Communities 750 Compressive properties 1,187 Computer applications 4,079 Computerized simulation 1,819 Computer programs 1,238 Concentration 2,333 Concrete admixtures 769 Concrete aggregates 531 Concrete durability 865 Concrete freezing 964 Concretes 753 Concrete strength 1,123 Concrete structures 1,119 Coniferales 495 Conservation 2,384 Construction 2,491 Construction equipment 832 Construction materials 2,028 Continental drift 1,284 Continental margin 771 Continental shelf 1,829 Convection 1,043 Cooling 927 Cores 3,445 Correlation 2,843 Corrosion 502 Cost analysis 1,360 Countermeasures 2,909 Cracking (fracturing) 668 Creep 561 Cretaceous 749 Crust 803 Crustacea 1,127 Crustal studies 791 Cryobiology 815 Cryogenic soils 2,517 Current research 973 Currents 2,455 Cycles 797 Cyclones and anticyclones 513